.vocabulary-practice {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
  
    .vocabulary-options {
      display: flex;
      gap: 15px;
      margin: 30px 0;
      flex-wrap: wrap;
  
      .control-button {
        padding: 12px 20px;
        border-radius: 8px;
        box-shadow: 0 2px 6px rgba(0, 0, 0, 0.1);
        transition: all 0.3s ease;
        border: none;
        background-color: #f8f9fa;
        color: #333;
        font-weight: 500;
  
        &:hover {
          transform: translateY(-2px);
          box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
          background-color: #e9ecef;
        }
  
        &.primary {
          background-color: #409eff;
          color: white;
  
          &:hover {
            background-color: #337ecc;
            box-shadow: 0 4px 12px rgba(64, 158, 255, 0.3);
          }
        }
  
        &:disabled {
          opacity: 0.6;
          cursor: not-allowed;
  
          &:hover {
            transform: none;
            box-shadow: 0 2px 6px rgba(0, 0, 0, 0.1);
          }
        }
      }
    }
  
    .vocabulary-info {
      margin: 25px 0;
    }
  
    .phonetic-display {
      text-align: center;
      padding: 20px;
      margin: 25px 0;
      border-radius: 10px;
      background: linear-gradient(135deg, #e8f4f8 0%, #f0f8ff 100%);
      box-shadow: 0 2px 6px rgba(0, 0, 0, 0.05);
      font-size: 1.3rem;
      color: #212529;
      font-weight: 500;
    }
  
    .exercise-section {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
      gap: 25px;
      margin: 30px 0;
    }
  
    .exercise-card {
      margin-bottom: 0;
      border-radius: 10px;
      box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
      transition: box-shadow 0.3s ease;
  
      &:hover {
        box-shadow: 0 6px 16px rgba(0, 0, 0, 0.1);
      }
  
      .card-header {
        font-weight: 600;
        font-size: 1.1rem;
        color: #212529;
      }
    }
  
    .spelling-exercise,
    .choice-exercise {
      padding: 0px;
    }
  
    .check-button {
      margin-top: 15px;
      background-color: #409eff;
      border-color: #409eff;
  
      &:hover {
        background-color: #337ecc;
        border-color: #337ecc;
      }
    }
  
    .choice-group {
      display: flex;
      flex-direction: column;
      gap: 15px;
      margin: 0px 0;
      align-items: flex-start;
    }
  
    .choice-item {
      margin-right: 0;
      font-size: 1rem;
    }
  
    .definition-display,
    .example-display {
      margin: 30px 0;
    }
  
    .definition-display h3,
    .example-display h3 {
      color: #212529;
      border-bottom: 1px solid #eee;
      padding-bottom: 10px;
      font-size: 1.3rem;
      font-weight: 600;
    }
  
    .meaning-item {
      margin: 15px 0;
      padding: 15px;
      border-radius: 8px;
      background-color: #f8f9fa;
    }
  
    .part-of-speech {
      font-weight: bold;
      color: #42b983;
    }
    
    .example-original {
      font-style: italic;
      color: #212529;
    }
  
    .example-translation {
      color: #495057;
    }
  
    .variations-section {
      margin-top: 25px;
      padding: 15px;
      border-top: 1px dashed #ccc;
    }
  
    .variations-section h4 {
      margin: 15px 0;
      color: #42b983;
      font-size: 1.1rem;
    }
  
    .variation-item {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-bottom: 12px;
      padding: 12px;
      background-color: #fffbe6;
      border-radius: 8px;
    }
  
    .variation-word {
      font-weight: bold;
      color: #e74c3c;
    }
  
    .variation-explanation {
      flex: 1;
    }
  
    // 响应式设计
    @media (max-width: 768px) {
      padding: 15px;
  
      .vocabulary-options {
        gap: 10px;
        margin: 20px 0;
  
        .control-button {
          padding: 10px 15px;
          font-size: 0.9rem;
        }
      }
  
      .phonetic-display {
        padding: 15px;
        font-size: 1.1rem;
        margin: 20px 0;
      }
  
      .exercise-section {
        gap: 20px;
        margin: 25px 0;
      }
  
      .check-button {
        width: 100%;
      }
  
      .spelling-exercise,
      .choice-exercise {
        padding: 15px;
      }
  
      .choice-item {
        font-size: 0.9rem;
      }
  
      .definition-display h3,
      .example-display h3 {
        font-size: 1.1rem;
      }
    }
  }